of: unittest: Remove error printing on OOM

There is no need to print a backtrace or other error message if
kzalloc(), kmemdup(), or devm_kzalloc() fails, as the memory allocation
core already takes care of that.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/unittest.c

···
 		}
 
 		nh = kzalloc(sizeof(*nh), GFP_KERNEL);
-		if (WARN_ON(!nh))
+		if (!nh)
 			return;
 
 		nh->np = np;
···
 
 	/* creating copy */
 	unittest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
-
-	if (!unittest_data) {
-		pr_warn("%s: Failed to allocate memory for unittest_data; "
-			"not running tests\n", __func__);
+	if (!unittest_data)
 		return -ENOMEM;
-	}
+
 	of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
 	if (!unittest_data_node) {
 		pr_warn("%s: No tree to attach; not running tests\n", __func__);
···
 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
 
 	std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
-	if (!std) {
-		dev_err(dev, "Failed to allocate unittest i2c data\n");
+	if (!std)
 		return -ENOMEM;
-	}
 
 	/* link them together */
 	std->pdev = pdev;